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| Titel |
Turbulence characteristics in the tropical mesosphere as obtained by MST radar at Gadanki (13.5° N, 79.2° E) |
| VerfasserIn |
M. N. Sasi, L. Vijayan |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 19, no. 8 ; Nr. 19, no. 8, S.1019-1025 |
| Datensatznummer |
250014313
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| Publikation (Nr.) |
 copernicus.org/angeo-19-1019-2001.pdf |
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| Zusammenfassung |
Turbulent kinetic energy
dissipation rates (ε) and eddy diffusion coefficients (Kz)
in the tropical mesosphere over Gadanki (13.5° N, 79.2° E), estimated from
Doppler widths of MST radar echoes (vertical beam), observed over a 3-year
period, show a seasonal variation with a dominant summer maximum. The observed
seasonal variation of ε and Kz in the
mesosphere is only partially consistent with that of gravity wave activity
inferred from mesospheric winds and temperatures measured by rockets for a
period of 9 years at Trivandrum (8.5° N, 77° E) (which shows two equinox and
one summer maxima) lying close to Gadanki. The summer maximum of mesospheric
ε and Kz values appears to be related to the
enhanced gravity wave activity over the low-latitude Indian subcontinent during
the southwest monsoon period (June – September). Both ε and Kz
in the mesosphere over Gadanki show an increase with an increase in height
during all seasons. The absolute values of observed ε and Kz
in the mesosphere (above ~80 km) does not show significant differences from
those reported for high latitudes. Comparison of observed Kz values
during the winter above Gadanki with those over Arecibo (18.5° N, 66° W)
shows that they are not significantly different from each other above the ~80
km altitude.
Key words. Meteorology and
atmospheric dynamics (middle atmosphere dynamics; tropical meteorology; wave
and tides) |
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